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Disable Uninitialized Use Warnings for Broken gcc Versions

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Some versions of gcc accept unsupported -W flags and run just fine if
there are no warnings, but die with an unsupported flag error if a
warning is encountered.  gcc 4.3 and gcc 4.4 both exhibit this
behavior for -Wno-maybe-uninitialized.  Therefore, if the flag check
for -Wno-maybe-uninitialized succeeds, only use
-Wno-maybe-uninitialized if we are using gcc version 4.7 or greater.
Use -Wno-uninitialized otherwise.

llvm-svn: 172543
This commit is contained in:
David Greene 2013-01-15 18:21:15 +00:00
parent 4eadd744d9
commit 04c65cf0ca
2 changed files with 30 additions and 3 deletions
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15
autoconf/configure.ac
View File

@ -1269,8 +1269,23 @@ then
then
CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
else
dnl Some versions of gcc accept unsupported -W flags if there is
dnl no warning but stop with an error when a warning is
dnl encountered. If this gcc is earlier than 4.7, just use
dnl -Wno-uninitialized.
gxx_version=`$CXX -dumpversion`
gxx_version_major=`echo $gxx_version | cut -d'.' -f1`
gxx_version_minor=`echo $gxx_version | cut -d'.' -f2`
gxx_version_patch=`echo $gxx_version | cut -d'.' -f3`
if test "$gxx_version_major" -ge "4" \
&& test "$gxx_version_minor" -ge "7"; then
dnl AC_SUBST doesn't work with empty strings.
NO_UNINITIALIZED=
else
NO_MAYBE_UNINITIALIZED=
CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
fi
fi
else
NO_UNINITIALIZED=

12
configure vendored
View File

@ -12257,7 +12257,19 @@ then
NO_UNINITIALIZED=`$CXX -Werror -Wno-uninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-uninitialized`
else
gxx_version=`$CXX -dumpversion`
gxx_version_major=`echo $gxx_version | cut -d'.' -f1`
gxx_version_minor=`echo $gxx_version | cut -d'.' -f2`
gxx_version_patch=`echo $gxx_version | cut -d'.' -f3`
if test "$gxx_version_major" -ge "4" \
&& test "$gxx_version_minor" -ge "7"; then
NO_UNINITIALIZED=
else
NO_MAYBE_UNINITIALIZED=
NO_UNINITIALIZED=`$CXX -Werror -Wno-uninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-uninitialized`
fi
fi
else
NO_UNINITIALIZED=